User:Sarcasticidealist/50% plus .5

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In groups whose size is a natural number, 50% + .5 is synonymous with simple majority. 50% + 1 is often incorrectly held to represent a simple majority, but this is true only for even numbers.

[edit] Proof

Let size of group = 11
50% of 11 = 5.5
50% + 1 of 11 = 6.5
6 < 6.5
Therefore, if 50% + 1 were equal to a simple majority, 6 would not be a majority of 11.